JPH04203492A - Variable capacity type gas compressor - Google Patents

Abstract

PURPOSE:To dispense with a front side block and make a light and small compressor by producing a front head with die casting of aluminum of a high silicon content and providing a bearing portion to support the shaft of a rotor on the inner peripheral portion of the front head unitedly. CONSTITUTION:A compressor body 1 is constructed with a cylinder block 4, a front head 30 provided with a bearing portion 30a to support the shaft 7 of a rotor on the inner peripheral portion unitedly, and a rear side block 6. The front head 30 is produced by die casting of aluminum of a high silicon content, hence it has sufficient strength for the bearing portion of the rotor shaft 7. Thereby the outer periphery of the rotor shaft 7 can be supported by the front head 30 provided with the bearing portion 30a on the inner periphery and a control plate 15, and a front side block made of iron can be dispensed with so as to reduce the number of parts items and so as to make a light and small compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a gas compressor used in car coolers and the like, and particularly relates to miniaturization of the main body of the device.

(Prior Art) In general, a variable displacement gas compressor, as shown in FIGS. 4 and 5, includes a compressor main body 1, a casing 2 with an open end that airtightly surrounds the main body 1, and a casing 2 that airtightly surrounds the main body 1. The front head 3 is attached to the open end surface of the front head 3.

The compressor main body 1 includes a cylinder block 4 having an elliptical inner circumference, a front side block 5 on both sides of the cylinder block 4, and a front side block 5 provided with bearings 5a for bearing a rotor shaft 7 on the inner circumference. It has a rear side block 6,
In the cylinder chamber thus formed, which has a substantially elliptical inner circumference, a rotor 9, which has a solid cylindrical shape and is integral with the rotor shaft 7 and has five vanes 8 attached to its circumference that can move forward and backward in the radial direction, rotates. It is freely suspended horizontally, and the bearing part 5a
The front side block 5 and the rear side block 6 are made of iron-based material, while the front head 3 is made of aluminum to reduce weight.

Further, a control plate 15 having a substantially disk shape and having a pair of intake holes 16 is pivotally mounted between the front side block 5 and the cylinder block 4, and the control plate 15 can be rotated within a predetermined angle. It is freely supported by the rotor shaft portion 7.

Note that detailed explanations of the compression process of the compressor and the structure of changes in compressor discharge capacity due to angular displacement of the control plate will be omitted.

Next, the drive means for the control plate will be explained.

The drive mechanism passes through a long groove 27 provided in the front side block 5, has one end 26a protruding into the suction chamber 11 formed between the front head 3 and the front side block 5, and has the other end fixed to the control plate 15. Drive pin 26
It is fitted into the front head 3 so as to move forward and backward in a direction perpendicular to the axis, and has an engagement recess 28 with one end surface 24a facing the suction chamber 11 and the other end surface 24b facing the space 29, into which the drive pin 26 is loosely fitted. , a driving piston 24 disposed adjacent to the outer periphery of the front side 70 and the front head 3.
a pressing spring 25 provided therein, having one end fixed to the front rad 3 and the other end fixed to one end surface 24a of the drive piston 24, constantly urging the drive piston 24 toward the space portion 29;
The space 29 is constantly supplied with lubricating oil from a high pressure chamber formed between the rear side block 6 and the case 2 via a throttle (not shown).

Therefore, the driving piston 24 is constantly moved to the space portion 2 by the total pressure of the suction pressure of the suction chamber 11 and the spring pressure of the pressing spring 25.
On the other hand, it is biased toward the suction chamber 11 side by the hydraulic pressure of lubricating oil that is constantly supplied to the space 29 from the high pressure chamber through a throttle (not shown), and the total force and hydraulic pressure are Due to balance, the front head 3 moves forward and backward in a direction perpendicular to the axis.

As a result, the drive pin 26 erected on the control plate 15
is moved in a direction perpendicular to the axis of the rotor shaft by the engaging portion 28 of the drive piston 24, and the control plate 15 rotates about the axis.

Note that the hydraulic pressure is controlled by draining lubricating oil into the suction chamber 11 using an automatic throttle valve in the drive piston 24, but a detailed explanation will be omitted.

(Problems to be Solved by the Invention) However, in such a conventional variable displacement most type gas compressor, the control plate 15 has an intake hole 16 that determines the volume of air admitted into the cylinder chamber, and On the other hand, the front side block 5
must function as a bearing for the rotor shaft, so it must be made of iron-based material. Transferring this function as a bearing for the rotor shaft to an aluminum front head will reduce the strength of the material as a bearing. Conventionally, it has been impossible to provide a bearing section integrally with the front head due to the shortage.

Therefore, between A and A in Fig. 4, the control plate 1
5. Since the front side block 5 is made of iron and has a bearing part 5a for bearing the rotor shaft part 7 on its inner circumference, and the front head 3 is made of aluminum, the number of parts is large (incurring high costs and the rotor shaft h). However, it has become larger in size and has become an impediment to weight reduction.

Further, since the front side block 5 is located around the rotor shaft portion 7, the drive piston 24 and the drive pin 26 are arranged on the outer periphery of the fitting portion with the front head 3 provided on the outer periphery of the bearing portion 5a of the front side block 5. will be established.

That is, this means that the drive piston 24 necessary to rotate the control plate 15 on which the drive pin 26 is erected is
The stroke of the drive piston 24 becomes longer because it is farther away from the axis of the rotor shaft 7, and the drive piston 24 becomes larger.As the drive piston 24 becomes larger, one end 24b of the drive piston 24 becomes closer to the main body of the device, as shown in FIG. There were problems such as protruding outward and poor design.

(Means for Solving the Problems) This invention was made in view of the above-mentioned circumstances, and its purpose is to provide a variable displacement most type gas compressor that is low cost, lightweight, and compact in design. The purpose of this invention is to provide an excellent gas compressor, and in order to achieve the two objectives, a cylinder with an almost elliptical inner circumference and a cylinder installed on both sides of the cylinder are used. a front head and a rear side block, a rotor that is rotatably suspended horizontally in a cylinder chamber constituted by the cylinder, the front head, and the rear side block, and has a plurality of vanes that can move forward and backward in the radial direction; and an inner surface of the front head. In a variable capacity gas compressor comprising a control plate rotatably mounted on a side thereof and a driving means for the control plate, the front head is formed of aluminum die-casting with increased silicon content. In addition, the rotor is characterized in that a bearing portion for bearing the shaft portion of the rotor is integrally provided on the inner peripheral portion.

(Function) In this invention, a front head is disposed on the outer periphery of the rotor shaft, which is made of aluminum die-casting with increased silicon content, and is integrally provided with a bearing portion for bearing the rotor shaft on the inner periphery. This makes it possible to omit the iron front side block that was previously required, and the drive pin that drives the control plate is placed adjacent to the outer periphery of the bearing of the front head, making the equipment smaller and lighter. can.

(Explanation of Examples) The following is a first description of the variable displacement most type gas compressor according to the present invention.
This will be explained in detail with reference to FIGS.

Note that the same reference numerals are used for the same parts as in the above conventional example, and detailed explanation thereof will be omitted.

The variable displacement gas compressor according to the present invention includes a compressor main body 1 and a casing 2 that is open at one end and surrounds the main body 1 in an airtight manner.

The compressor main body 1 has a cylinder block 4 having an elliptical inner circumference.
A front head 30 is located on both sides of the cylinder block 4, is attached to one end thereof, and is integrally provided with a bearing part 30a for bearing the shaft part 7 of the rotor on the inner peripheral part. It also consists of a rear side block 6 attached to the other end, and in the elliptical cylinder chamber formed by these, five vanes 8 that are integral with the shaft part 7 of the rotor shaft and that can freely move forward and backward around the rotor shaft are installed. A rotor 9 having a solid cylindrical shape is horizontally suspended so as to be freely rotatable.

Since the front head 30 is made of aluminum tie-casting with increased silicon content, it has sufficient material strength as a bearing for the rotor shaft. As shown in FIG. 1, the outer periphery of the rotor shaft is composed of a front head 30 and a control plate 15, which are integrally provided with a bearing 30a on the inner periphery, whereas the outer periphery of the conventional rotor shaft 7 is composed of a front head 30 and a control plate 15. As shown in Fig. 4, a front side block 5 made of iron is integrally provided with a bearing portion 5a on the inner circumference. Aluminum front head 3
and a control plate 15. That is, according to the compressor of the present invention, one part, that is, the front side block 5 made of iron, can be omitted compared to the conventional compressor, so that the number of parts can be reduced and the weight can be reduced.

Further, the control plate 15, which is pivotally attached between the L front head 30 and the cylinder block 5, is rotatably supported by the rotor shaft 7 within a predetermined angle of 1 degree using a drive means to be described later. ing.

There are four parts 16 at the peripheral edge of the control plate 15.
．． 16 are provided at 180° opposing positions, and the suction chamber 11 of the front head 30 and the cylinder chamber 12 communicate with each other through the recess 16.

That is, the control plate 15 functions to control the capacity of the compression chamber to keep the suction pressure constant during high-speed operation or low-speed operation.

When the rotor 9 is driven to rotate, the low-pressure refrigerant gas introduced from the suction hole 18 provided in the front head 30 flows into the cylinder chamber as shown by the solid arrow in FIG.
The high-pressure gas sucked into the cylinder block 2 and then compressed by the vanes 8 is discharged into the gap between the cylinder block 4 and the inner circumference of the casing 2 through a discharge port and a discharge valve (not shown).
Furthermore, a communication hole 2 is provided in the rear block 6 with a phase difference of approximately 90° from the recess 16 of the control plate 15.
1, the oil is supplied to an oil separator 22 provided at the back of the rear side block 6, and is discharged to the outside from the rear space of the casing 2 through a discharge hole 23, as shown by the broken line arrow in FIG.

Next, the structure and driving means of the control plate 15 will be explained based on FIG.
A drive pin 26 faces the control plate 15 and the other end is fixed to the control plate 15, and the drive pin 26 is fitted into the front head 3 so as to be movable back and forth in a direction perpendicular to the axis, with one end face 24a facing the suction chamber 11 and the other end face 24b. The drive piston 24 has an engagement recess 28 facing into the space 29 and into which the drive pin 26 is loosely fitted, and is disposed adjacent to the shaft portion 7 of the rotor. The drive piston 2 has its other end fixed to one end surface 24a of the drive piston 24.
4 to the side of the space 29, and a space 29 that is constantly supplied with lubricating oil from a high pressure chamber formed between the rear side block 6 and the case 2 through a throttle (not shown). It is configured.

Therefore, the driving piston 24 is constantly moved to the space portion 2 by the total pressure of the suction pressure of the suction chamber 11 and the spring pressure of the pressing spring 25.
On the other hand, the space 29 is constantly throttled (
(not shown) is urged toward the suction chamber 11 by the hydraulic pressure of lubricating oil supplied through a lubricating oil (not shown), and moves back and forth within the front head 3 in a direction orthogonal to the axis due to the balance between the total force and the hydraulic pressure.

As a result, the drive pin 26 erected on the control plate 15
is moved longitudinally in a direction perpendicular to the axis of the rotor shaft by the engagement recess 28 of the drive piston 24, and the control plate 15 rotates about the axis.

Note that the hydraulic pressure is controlled by draining lubricating oil into the suction chamber 11 using an automatic throttle valve in the drive piston 24, but a detailed explanation will be omitted.

That is, the compressor of the present invention is characterized in that the drive pin 26 for driving the control plate 15 is provided adjacent to the outer periphery of the bearing portion 30a of the front head. The drive locus of the drive pin 26 and the position of the drive piston will be compared and explained in the present application and the conventional example using FIG.

That is, what is shown in FIG. 6 represents the forward and backward strokes of the drive pin and drive piston in the conventional example.

Conventionally, the front side block 5 is interposed between the axis O of the rotor shaft portion and the drive pin 26, so the distance between the axis O and the drive pin 26 is L2.

On the other hand, in the present compressor, the drive pin 26 is provided adjacent to the outer periphery of the bearing part 30a of the front head '30, so the distance between the axis O of the rotor shaft part and the drive pin 26 is Ll, and both When compared, Ll<L2.

Therefore, the stroke of the drive piston in the conventional case! 2 is L
It is large because it is proportional to 2. On the other hand, in the compressor of this application, the forward and backward stroke of the drive piston! 1 is shorter than the locus L1 or L2, so its advance/retreat stroke! 1 is 4-mark! It is shorter than 2, and therefore the cylinder can be made smaller.

Note that θ in the figure indicates the rotation angle of the drive pin 26 and the rotor shaft portion with respect to the axis O.

(Effects of the Invention) In the variable displacement type gas compressor according to the present invention, the front head is formed of aluminum die-casting with increased silicon content, so that the rotor shaft can be bearing on the inner circumference of the front head. Since the bearing portion having sufficient strength can be integrally formed, the front side block made of iron can be omitted as a bearing function that was conventionally required.

Therefore, the number of parts can be reduced compared to conventional ones, and aluminum materials can be used instead of iron materials, so this type of gas compressor can be manufactured at low cost.
Moreover, it is possible to achieve reduction in weight and size.

In addition, in this invention, by erecting the drive pin that drives the control plate adjacent to the outer periphery of the bearing portion of the front head, the stroke of the drive piston required to rotate the control plate can be reduced. Since the drive piston can be made shorter, the drive piston can be made more compact.As shown in Figure 2, the end of the drive piston does not protrude from the main body of the device, resulting in excellent design. This has the effect of making it possible to improve the situation.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a variable capacity gas compressor according to the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a drive pin for rotating the control plate in the present invention. Fig. 4 is a cross-sectional view of a conventional variable displacement most type gas compressor, Fig. 5 is a sectional view taken along line IV-IV in Fig. 4, and Fig. 6 is a conventional control plate. FIG. 2 is an explanatory diagram showing the locus of a drive pin that rotates the drive pin. 1... Compressor body 4... Cylinder 6... Rear side block 8... Vane 9... Rotor 15... Control plate 26... Drive pin 30... Front head 30a... Bearing section patent applicant Seiko Seiki Co., Ltd.

Claims (2)

[Claims] 1. A cylinder whose inner periphery is formed into a substantially elliptical shape, a front head and a rear side block attached to both sides of this cylinder, and a cylinder chamber configured by the cylinder, front head, and rear side block, which is horizontally suspended rotatably. A variable capacity gas compression system comprising a rotor having a plurality of vanes that can move forward and backward in the radial direction, a control plate that is rotatably attached to the inner surface of the front head so as to be rotatable within a predetermined angle, and a drive means for the control plate. In the machine, the front head is formed of aluminum die-casting with increased silicon content, and is characterized in that the front head is integrally provided with a bearing part for bearing the shaft part of the rotor on the inner peripheral part. type gas compressor. 2. 2. The variable displacement gas compressor according to claim 1, wherein a drive pin for driving said control plate is provided upright adjacent to an outer periphery of a bearing portion of said front head.